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Date: Sun, 7 Jun 2020 06:14:47 -0700 (PDT)
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Subject: Re: Q: discrete_subtype_definition: static only cases?
From: gautier_niouzes@hotmail.com
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Xref: reader01.eternal-september.org comp.lang.ada:59004
Date: 2020-06-07T06:14:47-07:00
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On Sunday, June 7, 2020 at 3:02:56 PM UTC+2, Jeffrey R. Carter wrote:
> On 6/7/20 2:13 PM, gautier_niouzes@hotmail.com wrote:
> >> No. The basic principle is that types are static (they determine the
> >> underlying representation) and subtypes are dynamic.
> > 
> > Well, there are obviously exceptions to that basic principle:
> > 
> > procedure SD2 is
> > begin
> >    for I in 1 .. 3 loop
> >      declare
> >        type T is array (1 .. I) of Integer;  --  I is a variable
> >        B: T;
> >      begin
> >        null;
> >      end;
> >    end loop;
> > end;
> 
> Conceptually, this declaration is equivalent to
> 
> type /anon/ is array (Integer range <>) of Integer;
> subtype T is /anon/ (1 .. I);
> 
> So the (anonymous) type is static, but the (first-named) subtype is not.

...plus, the keyword "type" is used and not "subtype". And /anon/ could itself be dynamic (an array of a named dynamic (sub)type).
So basically types are static, except when they aren't ;-)